Relative Humidity Transmitter  $60

H1-420 current loop version   

H1-5V  0-5V version  


                0-5V three wire or current loop (4-20 mA) two wire version
  1/2" threaded PVC housing - 2" long
  Low cost humidity measurement for PLCs and control systems
  Comes with two mounting nuts
  +/- 4% accuracy
  Reverse polarity protected


  PVC 2" long 1/2 x 13 threads


  PVC 2" long 1/2 x 13 threads






RANGE 0 to 100% RH

OUTPUT - 420

Current loop (4-20mA) two wire  20mA = 100%RH
OUTPUT - 5V 0-5V output 5V = 100% RH
THREADS 1/2 x 13

Part Number H1-420 (current loop version)  H1-5V (0-5V version)


Accessories Description Price  
SMB1-050/088 Sensor mounting bracket 1/2" and 7/8" holes $5
SJB1-050 1/2" sensor junction box w/side gland $15




Design considerations

The H1 is a low cost way to input humidity information into a PLC, process control meter, distributed control system (DCS), or other industrial control system. The H1 can be mounted through any 1/2" hole and the two wires connected to an analog input card or other two wire 4-20 mA current loop circuit.

The H1 is designed for low cost applications where standard accuracy is acceptable.

The best readings are taken in moving or circulating air. Stagnant air can allow pockets of variable humidity to develop that may affect measurement accuracy.

Direct exposure to sunlight can cause warming that may affect reading accuracy.

Because the H1 has a PVC housing,  care should be taken to insure that the operating environment does not get so hot that the PVC housing will soften. This may happen at temperatures around 180 to 190 degrees F.

Can be ordered with shielded PVC instrumentation cable upon request.

The H1 should not be used as the sole sensing element in critical equipment or safety applications. 



EMS  47745 - 193rd St. Toronto SD 57268 USA (605) 794-2072 (P)     (605) 794-2073 (F)  email